"In a sports setting, it parlays into an increased ability to work out harder; or if they're going through testing to perform testing better; if they're studying a playbook to memorize the playbook," said Rick Figler, a Cleveland Clinic sports medicine physician. "It's absolutely a performance-enhancing agent."

Figler said the drug is addictive because it’s so effective.

"So if an athlete were to use it and said, 'My workout went really, really well,' he'd probably want to use it again," Figler said. "It's similar to if you miss your morning cup of coffee you may not feel on your game."

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